程序及分析
/*
* FileName : blend.cpp
* Author : xiahouzuoxin @163.com
* Version : v1.0
* Date : Mon 28 Jul 2014 08:47:59 PM CST
* Brief :
*
* Copyright (C) MICL,USTB
*/
#include <cv.h>
#include <highgui.h>
#include <stdio.h>
using namespace std;
using namespace cv;
int main(int argc, char *argv[])
{
double alpha = 0.5;
double beta;
double input;
Mat src1, src2, dst;
// User input alpha
cout<<"Simple Linear Blender" << endl;
cout<<"---------------------" << endl;
cout<<"Enter alpha [0-1]: ";
cin>>input;
if (alpha >=0 && alpha <=1) {
alpha = input;
}
// Read images
src1 = imread("../test_imgs/KeNan.jpg");
src2 = imread("../test_imgs/Background.jpg");
if (!src1.data) {
cout<<"Error loading src1\n"<<endl;
return -1;
}
if (!src2.data) {
cout<<"Error loading src2\n"<<endl;
return -1;
}
// Create WIndows
namedWindow("Linear Blend", 1);
beta = (1.0 - alpha);
addWeighted(src1, alpha, src2, beta, 0.0, dst);
imshow("Linear Blend", dst);
waitKey(0);
return 0;
}
这里的图像叠加指线性叠加,设图像A的像素为fA(x),图像B的像素为fB(x)。叠加系数为α,则线性叠加操作为:
![](https://camo.githubusercontent.com/15b0b03843a9f037d6398b2d31d6fd6035b206c4/687474703a2f2f7777772e666f726b6f73682e636f6d2f6d6174687465782e6367693f2532302535434c61726765253230672878293d253543616c706861253230665f412878292b28312d253543616c70686129665f42287829)
α为0-1之间的值,从上面也能够看出,叠加必需保证两幅输入图像的尺寸大小同样。程序中的
addWeighted(src1, alpha, src2, beta, 0.0, dst);
完毕叠加操作。
效果
![result](https://github.com/xiahouzuoxin/notes/raw/master/images/OpenCV%E5%9F%BA%E7%A1%80%E7%AF%87%E4%B9%8B%E5%9B%BE%E7%89%87%E5%8F%A0%E5%8A%A0/result.png)
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